<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="./css/inputnumber.css" />
    <link rel="stylesheet" href="./css/index.css" />
    <title>购物车</title>
  </head>
  <body>
    <div class="app-container" id="app">
      <!-- 顶部banner -->
      <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
      <!-- 面包屑 -->
      <div class="breadcrumb">
        <span>🏠</span>
        /
        <span>购物车</span>
      </div>
      <!-- 购物车主体 -->
      <div class="main">
        <div class="table">
          <!-- 头部 -->
          <div class="thead">
            <div class="tr">
              <div class="th">选中</div>
              <div class="th th-pic">图片</div>
              <div class="th">单价</div>
              <div class="th num-th">个数</div>
              <div class="th">小计</div>
              <div class="th">操作</div>
            </div>
          </div>
          <!-- 身体 -->
          <div class="tbody">
            <div :class="{tr: true, active: item.isChecked}" v-for="(item, index) in fruitList" :key="item.id">
              <div class="td"><input type="checkbox" v-model="item.isChecked"/></div>
              <div class="td"><img :src="item.icon" alt="" /></div>
              <div class="td">{{ item.price }}</div>
              <div class="td">
                <div class="my-input-number">
                  <button class="decrease" @click="decrease(index)" :disabled="item.num <= 1"> - </button>
                  <span class="my-input__inner">{{ item.num }}</span>
                  <button class="increase" @click="increase(index)"> + </button>
                </div>
              </div>
              <div class="td">{{ item.price * item.num }}</div>
              <div class="td"><button @click="del(item.id)">删除</button></div>
            </div>
<!-- 
            <div class="tr">
              <div class="td"><input type="checkbox"/></div>
              <div class="td"><img src="./img/荔枝.png" alt="" /></div>
              <div class="td">7</div>
              <div class="td">
                <div class="my-input-number">
                  <button disabled class="decrease"> - </button>
                  <span class="my-input__inner">1</span>
                  <button class="increase"> + </button>
                </div>
              </div>
              <div class="td">14</div>
              <div class="td"><button>删除</button></div>
            </div> -->
          </div>
        </div>
        <!-- 底部 -->
        <div class="bottom">
          <!-- 全选 -->
          <label class="check-all">
            <input type="checkbox" v-model="checkedAll"/>
            全选
          </label>
          <div class="right-box">
            <!-- 所有商品总价 -->
            <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ amount }}</span></span>
            <!-- 结算按钮 -->
            <button class="pay">结算( {{ total }} )</button>
          </div>
        </div>
      </div>
      <!-- 空车 -->
      <div class="empty" v-if="fruitList.length === 0">🛒空空如也</div>
    </div>
    <script src="./js/vue-2.7.14.js"></script>
    <script>
      // 转成布尔是 false 的有：0 '' null undefined NaN 2===1
      // 除此之外，其他值转成布尔都是 true。比如：[] {} 转成布尔都是 true
      const app = new Vue({
        el: '#app',
        data: {
          // 水果列表
          fruitList: JSON.parse(localStorage.getItem('fruitList')) || [
            {
              id: 1,
              icon: './img/火龙果.png',
              isChecked: true,
              num: 2,
              price: 6,
            },
            {
              id: 2,
              icon: './img/荔枝.png',
              isChecked: false,
              num: 7,
              price: 20,
            },
            {
              id: 3,
              icon: './img/榴莲.png',
              isChecked: false,
              num: 3,
              price: 40,
            },
            {
              id: 4,
              icon: './img/鸭梨.png',
              isChecked: true,
              num: 10,
              price: 3,
            },
            {
              id: 5,
              icon: './img/樱桃.png',
              isChecked: false,
              num: 20,
              price: 34,
            },
          ],
        },
        methods: {
          del(id) {
            this.fruitList = this.fruitList.filter(item => item.id !== id)
          },
          decrease(index) {
            this.fruitList[index].num--
          },
          increase(index) {
            this.fruitList[index].num++
          }
        },
        computed: {
          // 总价格
          amount() {
            let result = this.fruitList.filter(item => item.isChecked)
            return result.reduce((acc, item) => {
              return acc + item.price * item.num
            }, 0)
          },
          // 总数量
          total() {
            let result = this.fruitList.filter(item => item.isChecked)
            return result.reduce((sum, item) => sum + item.num, 0)
          },
          checkedAll: {
            get() {
              return this.fruitList.every(item => item.isChecked)
            },
            set(val) {
              // console.log(val)
              this.fruitList.forEach(item => {
                item.isChecked = val
              })
            }
          }
        },
        watch: {
          fruitList: {
            handler(val) {
              localStorage.setItem('fruitList', JSON.stringify(val))
            },
            deep: true,
            immediate: true
          }
        }
      })
    </script>
  </body>
</html>
